Projection-lamp carbon-holder or saver



y 1934- A. WILCZEK 1,958,981

PROJECTION LAMP CARBON HOLDER OR SAVER Filed Sept. 10, 1932 ATTORNEY Patented May 15, 1934 lTED STATS PROJECTION-LAMP CARBON-HOLDER OR SAVER Ludwic A. Wilczek, New York, N. Y.

Appiication September 10, 1932, Serial No. 632,536

2 Claims.

This invention relates to carbon savers for projection lamp arc carbons, and has for one of its objects the provision of auxiliary means for holding, guiding and transmitting rotary move- 'a ment to the positive carbon of such projection lamp after the said carbon has been partially consumed, and the rear end thereof has left the usual rotating and guiding means which is located at a considerable distance from the arc.

Another object of the invention is to provide such a carbon saver Which will firmly hold the said carbon and prevent slippage thereof.

Another object is to produce a device of the character described in which the maximum simplicity of construction and operation is secured. Other objects and advantages will appear as the nature of the improvements is better understood, the invention consisting substantially in the novel arrangement and co-relation of parts herein fully described, and illustrated in the accompanying drawing, wherein similar reference characters are used to describe corresponding parts throughout the several views, and then finally pointed out and specifically defined and indicated in the appended claims.

The disclosure made the basis of exemplifying the present inventive concept suggests a practical embodiment thereof, but the invention is not to be restricted to the exact details of this disclosure, and the latter, therefore, is to be understood from an illustrative, rather than a restrictive standpoint.

I'he inventive idea involved is capable of receiving a variety of mechanical expressions, one of which, for the purpose of illustration, is shown in the accompanying drawing, in which Figure l is a side view in elevation of my improved carbon saver inserted into a carbon and also diagrammatically showing a portion of the projection lamp mechanism.

Figure 2 is a longitudinal cross section through the holder showing same in gripping engagement with the rear end of a carbon.

Figure 3 is a fragmental perspective view of the rear end of a carbon.

Figure 4 is a similar view of the front end of the carbon saver.

Figure 5 is a front end view of a modified form of saver, and

Figure 6 is a fragmental side view in elevation of still another modified form of saver.

It is a well known fact that due to the construction of the present day projection lamps for moving pictures, a great deal of the positive carbon is wasted as the entire length of the said carbon cannot be properly fed and guided thereby. To obviate this undesirable feature, I have perfected my present invention whereby I am enabled to eliminate the major portion of such waste.

Referring now to the drawing in detail 10 indicates the negative carbon of a high intensity moving picture projection lamp and 11 the positive carbon, which is suitably rotated and fed forwardly by means of a feeding mechanism generally indicated at 12. The said feeding and rotating mechanism comprises sets of gears 14 and 15 and a bearing 16 beyond which the carbon 11 cannot be normally fed in the present day projection lamp. In order that the said carbon 11 may be properly guided and fed after it has left the bearing 16 and rotated during such feeding movement, so that substantially the entire length thereof may be utilized, I remove a portion of the soft core 18 of the carbon 11 to provide an opening, cavity or chamber 19 at the rear end thereof. Into the said opening 19 I insert the split end 20 of a tubular member 21 whose outer diameter is the same as that of the carbon 11 so that it may be rotated by the gears 14 and 15 and pass through the bearing 16.

In order that the split end 20 of the saver may firmly engage and hold the carbon 11, I provide a wedge or rod 22 having at the forward end thereof a head 23 which is adapted to be drawn through the inner bore 24 of the split end 20, by means of a nut 25 on the threaded end 26 of the rod. 22. The said nut 22 is rotatably mounted at the rear end of the tubular member 21 and is maintained therein by means of a head 27 forced or spun into a groove 28 in the said nut 25. The rod 22 is prevented from leaving the nut 25 by means of a head 29 at the rear end thereof.

It will be seen by referring to Figs. 1 and 2 that by rotating the nut 25 in a clockwise direction the head 23 is drawn into the interior of the split extension 20 and forces or wedges the sections thereof against the interior surface of the cavity 19 to provide a gripping action between the said parts so that when the member 21 is rotated the carbon will rotate therewith.

In Fig. 4 I have shown the end 20 as split in half, and in Fig. 5 I have shown same as split into four parts, but if desired the said end may be split into any number of parts.

In Figs. 1 to 5, I have shown the opening 18 and extension 20 as hexagonal, but the same may be of any number of sides or it may be circular and if desired the extension 20 may be threaded as shown in Fig. 6 so as to provide a bite therebetween and the opening 19.

While I have described the carbon rotating means as comprising sets of gears 14 and 15, only one such set of gears may be employed if desired at or near either end of the bearing 16.

From the foregoing it will be seen that I have provided a carbon saver that may be inserted into one end of a carbon and positively grip same, so that the said saver will transmit feeding and rotating movement to the carbon and will guide same after it has left the bearing and rotating wheels, thus permitting the maximum amount of carbon to be utilized, and further to permit a steady flow of electric current, even though the carbon has left the electrode.

Having described my invention what I claim as new and desire to secure by Letters Patent is:

1. A carbon holder for use in a light projection machine, comprising a tube of the same external diameter as that of the carbon to be held thereby, a gripping element on one end. of the tube having a plurality of resilient prongs normally forming a substantially cylindrical extension on the tube with an external diameter less than that of the tube, and adapted to be inserted into the end of the hollow carbon to be held by the holder, a bolt extending through the tube and into the extension prongs and embodying a tapered head for spreading the prongs and a member at the other end of the tube for adjustably positioning the bolt.

2. A carbon holder for use in a light-projection machine, comprising a tube of the same external diameter as that of a carbon to be held thereby, a gripping element on the end of the tube having a plurality of resilient prongs normally forming a cylinder extension on the tube, with an external diameter less than that of the tube, and adapted to be inserted into the end of a hollow carbon to be held by the holder, a bolt extending through the tube and through the cylinder formed by the extension prongs and embodying a tapered head for spreading the prongs and a threaded shank for adjustment, and an adjusting cylinder fitting over the rear end of the tube and having a threaded orifice for receiving the threaded shank of the bolt and for adjustably positioning it.

LUDWIC A. WILCZEK. 

